Physical Chemistry Answers

A monoatomic gas ideal gas at 300k has a volume of 15 liter at a pressure 15 atm

Calculate the standard free energy changes for the following reactions at 25°C using the data table

below and using the equation :

ΔG°(rxn) = Ʃ ΔG°f (products) - Ʃ ΔG°f (rectants )

Substance ΔG° f (kJ/mol) S°(J/K·mol

CH 4 (g) -50.8 186.264

CO 2 (g) -394.4 213.74

H 2 O (l) -237.2 109.6

MgO (s) -569.6 26.94

a. CH 4 (g)+ 2 O 2 (g) -> CO 2 (g)+ 2 H 2 O (l)

b. 2MgO(s)-> 2Mg (s) + O 2

2. Using the same chemical reaction in a above, Calculate for ΔS° in J/K .mol

For which of the following reaction is ΔS negative ?

a. 2O​ 3 ​​(g)→3O​ 2 ​​(g)

b. 4Fe (s) + 3O 2 (g) → 2Fe 2 O.(s)

c. 2NH 3 (g) → N 2 (g) + 3H 2 (g)

Calculate the standard free energy changes for the following reactions at 25°C using the data table

below and using the equation :

ΔG°(rxn) = Ʃ ΔG°f (products) - Ʃ ΔG°f (rectants )

Substance ΔG° f (kJ/mol) S°(J/K·mol

CH 4 (g) -50.8 186.264

CO 2 (g) -394.4 213.74

H 2 O (l) -237.2 109.6

MgO (s) -569.6 26.94

a. CH 4 (g)+ 2 O 2 (g) -> CO 2 (g)+ 2 H 2 O (l)

b. 2MgO(s)-> 2Mg (s) + O 2

An object has a volume of 25cm3 with a density of 80g/cm3.  What is the mass of the object?

a 0.2025g sample consiting of only Bacl2 and kcl required 20.25ml 0.1200M AgNo3 solution for the quantitative precipitation of chloride. calculate the %Ba and %k of the sample

calculate the % sodium in a 0.721 g detergent sample

A certain liquid has a normal boiling point of 338.15k. using Trouton's rule

1. estimate the vapor pressure at 325.15k 2.estimate the boiling point at a pressure of 0.267bar

On the basis of your experience, predict which of the following reactions are spontaneous. Explain each of your answer 

(a) CO2(s) : CO2(g) at 25°C                        

(b) NaCl(s) →: NaCl(,) at 25°C 

(c) 2 NaCl(s) → 2 Na(s) + Cl2(g) 

(d) CO2(g) →: C(s) + O2(g)

Predict NMR spectrum of CH2Cl-CHCl2.